/* 
 *  Copyright 2012 CodeMagi, Inc.
 * 
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.codemagi.servlets.upload.util;

import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;

/**
 * @author Pierre-Alexandre Losson (Original Author) -- http://www.telio.be/blog -- plosson@users.sourceforge.net
 */
public class UploadListener implements OutputStreamListener {

    Logger log = Logger.getLogger(this.getClass());

    private HttpServletRequest request;
    private long delay = 0;
    private long startTime = 0;
    private int totalToRead = 0;
    private int totalBytesRead = 0;
    private int totalFiles = -1;

    public UploadListener(HttpServletRequest request, long debugDelay) {
        this.request   = request;
        this.delay     = debugDelay;
        totalToRead    = request.getContentLength();
        this.startTime = System.currentTimeMillis();
    }

    public void start() {
        totalFiles ++;
        updateUploadInfo("start");
    }

    public void bytesRead(int bytesRead) {
        totalBytesRead = totalBytesRead + bytesRead;
        updateUploadInfo("progress");

        try {
            Thread.sleep(delay);

        } catch (InterruptedException e) {
            log.debug("", e);
        }
    }

    public void error(String message) {
        updateUploadInfo("error");
    }

    public void done() {
        updateUploadInfo("done");
    }

    private long getDelta() {
        return (System.currentTimeMillis() - startTime) / 1000;
    }

    private void updateUploadInfo(String status) {
        long delta = (System.currentTimeMillis() - startTime) / 1000;
        request.getSession().setAttribute("uploadInfo", new UploadInfo(totalFiles, totalToRead, totalBytesRead,delta,status));
    }

}
